[Stgt-devel] Performance of SCST versus STGT

[Bart Van Assche]

On Jan 24, 2008 8:06 AM, Robin Humble <robin.humble+stgt at anu.edu.au> wrote:
> On Tue, Jan 22, 2008 at 01:32:08PM +0100, Bart Van Assche wrote:
> >
> >.............................................................................................
> >.                           .   STGT read     SCST read    .    STGT read      SCST read    .
> >.                           .  performance   performance   .   performance    performance   .
> >.                           .  (0.5K, MB/s)  (0.5K, MB/s)  .   (1 MB >MB/s)   (1 MB, MB/s)  .
> >.............................................................................................
> >. Ethernet (1 Gb/s network) .      77             78       .         77            89       .
> >. IPoIB    (8 Gb/s network) .     163            185       .        201           239       .
> >. iSER     (8 Gb/s network) .     250            N/A       .        360           N/A       .
> >. SRP      (8 Gb/s network) .     N/A            421       .        N/A           683       .
> >............................................................................................
>

Results with /dev/ram0 configured as backing store on the target (buffered I/O):
                    Read          Write             Read          Write
                  performance   performance       performance   performance
                  (0.5K, MB/s)  (0.5K, MB/s)      (1 MB, MB/s)  (1 MB, MB/s)
STGT + iSER           250          48                 349          781
SCST + SRP            411          66                 659          746

Results with /dev/ram0 configured as backing store on the target (direct I/O):
                    Read          Write             Read          Write
                  performance   performance       performance   performance
                  (0.5K, MB/s)  (0.5K, MB/s)      (1 MB, MB/s)  (1 MB, MB/s)
STGT + iSER             7.9         9.8               589          647
SCST + SRP             12.3         9.7               811          794

Bart.